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An Overland Park police vehicle sitting in front of the Jewish Community Center of Greater Kansas City, Kan., following shootings there and later at a nearby assisted-living complex that killed a total of three people on April 13, 2014. (Jamie Squire/Getty Images via JTA)

WASHINGTON — The suspect in the deadly shooting attack on two Jewish targets in a Kansas City, Kan., suburb was identified as a prominent white supremacist.

The Southern Poverty Law Center, a hate group monitor, identified the alleged gunman as Frazier Glenn Miller, 73, of Aurora, Mo., and said he was the “grand dragon” of the Carolina Knights of the Ku Klux Klan in the 1980s and subsequently a founder of the White Patriot Party.

The center in a statement Sunday evening said Miller served three years in prison on weapons charges and for plotting the assassination of its founder, Morris Dees.

CBS Newsalso identified the suspect as Miller, and a security source confirmed that the suspect had a long history in the supremacist movement.

Miller is suspected of killing a grandfather and his grandson on Sunday at the Jewish Community Center in Overland Park, Kan., and then shooting to death a female resident of Village Shalom, a Jewish assisted-living facility a few blocks away.

The family of the victims killed at the JCC identified them as William Lewis Corporon and his 14-year-old grandson, Reat Griffin Underwood, ABC news reported. KSHB, a local TV station, said they were members of the Church of Resurrection.

The JCC was hosting a dance class and an audition for a play, both for teenagers, according to reports.

President Obama in a statement “pledged the full support of the federal government” in the investigation.